LONDON (Reuters) - British Prime Minister David Cameron vowed on Friday to use all means at his disposal to hunt down militants such as "Jihadi John" after the killer was identified as a Kuwaiti-born computer programming graduate from London.
The black-clad militant brandishing a knife and speaking with an English accent was shown in videos released by Islamic State (IS) apparently decapitating hostages including Americans, Britons and Syrians.
